A large number of new entries have been added to the Complete 9/11 Timeline
at History Commons describing important events that took place on the day of
9/11, while other new entries add to the growing body of information about 9/11-related
training exercises.

One new entry describes how, from 1998, the US Secret Service included computer simulations of planes crashing into the White House in its training exercises. Another notable exercise was held early on the morning of September 11 in the White House Situation Room, based on the scenario of a terrorist bombing in the Middle East.

Also relating to training exercises, new details have emerged about an FBI anti-terrorist unit that was stranded away from Washington at the time of the 9/11 attacks. The Critical Incident Response Group arrived in San Francisco the day before 9/11 for a week of training. Such was the unit's importance that the White House made getting it back to Washington a priority in the hours after the attacks.

An entry describes how an air traffic controller changed the flight plan of the hijacked Flight 93, thereby apparently causing mistaken reports that the plane was still airborne after it crashed. Also, a special plane operated by NASA was flying over New York State at the time of the attacks, and at one point Flight 93 flew less than 1,000 feet below it.

Finally, an interesting new entry reveals how a novel by a popular thriller writer, published in 2000, predicted the possibility of a terrorist attack involving a jumbo jet crashing into the World Trade Center.

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